You might think of Idaho and potatoes in the same sentence, but we promise, there’s more to this beautiful state than that. In fact, did you know it’s a great place to build a modular home?
You may be here because you’re looking for affordable housing without sacrificing quality or beauty. We can certainly identify with that desire.
The bigger questions still remain, however.
What regulations does Idaho have for modular homes?
Will I need permits?
What about utility requirements?
It can quickly feel overwhelming, which is why Zook Cabins has compiled the information you need in one place.
With over two decades of experience in the housing industry, our goal is to simplify the process and give you the information you need to feel confident taking the next step.
Ready to learn what you need to know about Idaho’s county requirements, permits, setbacks, utilities, and more? Let’s get started.
Modular Home Requirements by County
Does Ada County, Idaho Allow Modular Homes?
Yes, Ada County allows modular home construction! In unincorporated Ada County, a modular residence is evaluated as a dwelling under the county’s zoning code.
Rural Residential is one of the most relevant districts for modular-home sites. Under the current county code, the base RR district generally requires 10 acres, while qualifying rural-residence lots can range from one to 2.5 acres under the county’s rural-residence provisions. Minimum street frontage is 100 feet.
Setbacks in the RR district are generally 50 feet from an arterial, collector, or section-line street and 30 feet from another roadway. Interior property-line and rear setbacks are generally 25 feet. A rural residence adjacent to another rural residence can qualify for a 10-foot interior-side setback under the code’s exception. Maximum residential building height is generally 35 feet.
More suburban Ada County residential districts have much smaller yards. For example, R6 generally requires 20-foot front, 5-foot interior-side, 15-foot street-side, and 15-foot rear setbacks. This illustrates why the parcel’s exact zoning must be identified before determining the modular home’s footprint.
These county standards apply to unincorporated Ada County. Boise, Meridian, Eagle, Kuna, Star, and Garden City maintain their own development regulations. For more information, we recommend you connect with the Planning and Zoning Department.
Does Adams County, Idaho Allow Modular Homes?
Yes, Adams County allows modular home construction and handles modular-home site development through its building-permit process, with the county’s locally adopted setback standards applying to residential construction regardless of whether the dwelling was assembled conventionally or constructed as a state-regulated modular building.
The Adams County Building Department currently lists a general setback of 20 feet from property lines and 80 feet from the centerline of a right-of-way. These are the county standards applicants should account for when laying out a residential building site.
Adams County also has unusually significant structural design requirements because of its mountainous terrain and snow conditions. The county lists roof snow loads ranging from approximately 80 pounds per square foot around Council, the Salmon River, and Indian Valley to 100 pounds around New Meadows, 120 pounds around Rock Flat and Bear, and a 240-pound ground snow load around Brundage Mountain. The county also uses a 24-inch frost depth.
A county building permit is required, and the Building Department notes that engineering can be required depending on the project.
Does Bannock County, Idaho Allow Modular Homes?
Yes. Bannock County allows single-family dwellings across several agricultural and residential districts, so a modular residence must satisfy the same lot-size and building-placement standards applicable to the residential use in the parcel’s zoning district.
In the Residential Suburban district, a single-family residence generally requires at least one acre, with setbacks of 30 feet from a local-road right-of-way, 50 feet from an arterial or collector right-of-way, 10 feet from the sides, and 20 feet from the rear.
Maximum structure height is 35 feet. Where an individual well or septic system is used within a city Area of Impact, the minimum lot can increase to five acres.
The Residential Rural district generally requires a five-acre minimum lot. A single-family residence requires 30 feet from a local-road right-of-way, 50 feet from an arterial or collector, 10-foot side yards, and a 30-foot rear yard.
Building permits are required, while septic permitting is handled through Southeastern Idaho Public Health.
Does Bear Lake County, Idaho Allow Modular Homes?
It does! Bear Lake County permits residential construction subject to its county land-use regulations, and a modular residence must meet the same site-placement standards applicable to a dwelling on the property.
The county publishes especially straightforward general residential setbacks. Structures normally must be at least 30 feet from a public right-of-way and 5 feet from both side and rear property boundaries. Maximum structure height is 35 feet, and the general minimum lot width is 100 feet.
Waterfront and waterway setbacks are also important in Bear Lake County. The county requires at least 25 feet from the Bear Lake waterline when the lake is at elevation 5,923.65 feet, 20 feet from a river, stream, or creek, and 15 feet from an irrigation ditch or canal.
The county cautions that exceptions apply in Agricultural, Rural Community, Commercial, and Industrial zoning, so those general setbacks should not automatically be applied to every parcel. A development permit and building permit should be obtained as applicable before installation.
Does Benewah County, Idaho Allow Modular Homes?
Benewah County allows modular home construction and regulates the site build through its current land-use, subdivision, building, and flood-control codes, while Idaho’s state modular-building program governs the off-site factory construction of the home itself.
Benewah County’s Planning & Zoning Department administers the current land-use code under Title 11, along with subdivision regulations under Title 9.
Unlike some Idaho counties, the county does not publish one simple residential setback on its main permitting page that can safely be applied to every parcel. The applicable requirements should therefore be determined from the property’s current land-use status, recorded plat, and applicable county code.
A building permit is required for residential construction. The county Building Department also directs applicants separately to state electrical, plumbing, and HVAC permitting and to Panhandle Health District for septic requirements.
Floodplain development has its own county permit and ordinance. Driveway approaches can require additional approval as well, so access, septic placement, floodplain status, and recorded easements should all be checked before establishing the modular-home footprint.
Does Bingham County, Idaho Allow Modular Homes?
Yes, Bingham County allows and regulates modular-home placement according to its general standards for residential buildings, with the road classification, zoning, lot size, waterways, and access serving as major factors in determining the usable building area.
The county’s front setback is based primarily on the roadway. A residence or other permitted structure generally must remain 50 feet from the right-of-way of Interstate 15 or a state highway, 30 feet from a major collector, collector, or local-road right-of-way, and 20 feet from a private road or easement.
For a residence, the standard interior side setback is 5 feet and the rear setback is 20 feet. Additional use-specific setbacks can apply under other sections of the zoning ordinance.
Residential lot size also depends on utilities and subdivision status. Outside a platted subdivision, an approved residential parcel generally requires at least one acre. Within subdivisions, R and R/A lots generally require one acre with an individual well and septic system, one-half acre where either water or sewer is shared, and one-quarter acre in the R district where both community water and sewer are provided.
Interested homeowners can connect with the Planning and Zoning Department for more information.
Does Blaine County, Idaho Allow Modular Homes?
Yes, Blaine County allows single-family residential modular home development through several rural and residential zoning districts, and a modular residence must comply with the dimensional requirements of the district just as another dwelling would.
In the R-1 Low Density Residential district, the minimum lot width is 100 feet. Front setbacks are 100 feet from State Highway 75, 50 feet from other major roads, and 25 feet from minor roads. Side and rear setbacks start at 10 feet for the first 10 feet of building height and increase by one foot for each additional two feet of height. Maximum building height is 35 feet.
Lower-density districts have larger yards. R-10 Rural Residential generally requires a 400-foot minimum lot width, 25-foot side and rear setbacks, and the same 100/50/25-foot road-based front setback system.
Environmental constraints can be even more important than the ordinary property-line setbacks. In the RR-40 Rural Remote and A-40 Productive Agricultural districts, the county generally requires 100 feet from wetlands. New subdivision lots adjoining federally managed or Idaho state endowment lands can also require 30-foot setbacks, increasing to 50 feet for lots of five acres or more.
Does Boise County, Idaho Allow Modular Homes?
Yes, Boise County handles modular residential projects through its building and land-use permitting system, and its current permit instructions provide unusually clear countywide minimum residential setbacks.
For residential construction, the county requires at least 20 feet from the front property line, 20 feet from the rear, and 10 feet from each side property line. The site plan submitted with the building permit must show the actual distances from the proposed building to each property line.
A residence must also generally remain at least 6 feet from other existing buildings on the same property. For a creek or stream, the setback must equal the width of the stream or 25 feet, whichever is greater. HOA covenants or recorded CC&Rs can impose larger setbacks even where the county minimum is satisfied.
Wildland fire requirements are particularly important in Boise County. The permit site plan must show defensible space for properties subject to the Wildland-Urban Interface requirements, and the county’s residential handbook and current Unified Land Ordinance should be checked for other site-specific standards.
A county building permit is required, while electrical, plumbing, and mechanical permitting may involve the applicable state/local permitting authority. Floodplain development requires separate review where applicable.
To learn more about what your property requires, head to the Boise County Planning and Zoning Department.
Does Bonner County, Idaho Allow Modular Homes?
Yes, Bonner County allows and regulates modular-home sites through its zoning and Building Location Permit system, with the underlying zone controlling density and dimensional standards.
The Rural zones are especially relevant for new modular-home sites. In the R-5 district, the normal property-line setback is generally 25 feet. The minimum lot size for newly created R-5 parcels is five acres.
Bonner County provides special setback relief for certain legal nonconforming parcels. A qualifying parcel under one acre can generally use a 5-foot property-line setback, while one larger than one acre but smaller than five acres can generally use a 10-foot setback. These exceptions do not eliminate easement, septic, shoreline, or other applicable restrictions.
The Suburban zone generally uses a 5-foot minimum property-line setback under the county dimensional table, while Planned Unit Developments can have approved setbacks that differ from the normal zoning tables.
Does Bonneville County, Idaho Allow Modular Homes?
Yes, modular homes are regulated and allowed the same as site-built homes in Bonneville County.
In the R-1 Residence Zone, single-family dwellings are the primary residential use. The district generally anticipates lots of at least 8,000 square feet and 75 feet in width. A single-family dwelling requires at least a 30-foot front yard unless the county’s major-road setback requirements impose a greater distance.
Interior side setbacks in R-1 are calculated partly from the dimensions of the building: the setback must equal at least 1.5 inches for each foot of building length or 8 inches for each foot of building height, whichever produces the greater distance, but can never be less than 8 feet. A corner-lot street side requires 30 feet.
The R-1 rear-yard requirement follows the Residence Park standards, which in turn use the RA-1 rear-yard requirement. That results in a minimum 20-foot rear yard for the main residence.
Bonneville County also has RA-1 through RA-4 residential-agricultural districts, R-1.5, R-2, R-3, Recreational-Forestry, and other classifications with their own dimensional standards, so the R-1 figures should not be treated as countywide requirements. Major county roads can also trigger greater setbacks under section 156.044.
Does Boundary County, Idaho Allow Modular Homes?
Yes. Boundary County allows and specifically addresses modular homes in its residential construction guidance.
The county does not perform conventional building inspections beyond those required by the State of Idaho for construction or setup of a modular or mobile home, but a county residential placement permit is required before construction or installation begins.
For property in the Residential zone, the county generally permits one single-family primary residence on a buildable parcel. Where both community water and sewer are available, residential density can be as small as one-quarter acre; where only one of those services is available, the standard is one acre; and where neither is available, the standard is generally 2.5 acres. Structure setbacks are 20 feet from a road and 5 feet from side and rear property lines.
Rural Residential property uses considerably larger standards. The zoning district generally has a five-acre density and requires structures to remain 20 feet from property lines.
Does Butte County, Idaho Allow Modular Homes?
Butte County regulates and allows residential construction through its zoning ordinance and building-permit system, so a modular residence should be treated as a dwelling that must comply with the land-use requirements applicable to the parcel rather than as an exemption from county development controls.
The county maintains Zoning Ordinance 1999-3 as part of its adopted ordinance framework and separately requires building permits for applicable construction. Butte County has continued to adopt and update building-code requirements over time, including its building-permit ordinance and subsequent building-code ordinances.
Unlike several neighboring Idaho counties, Butte County does not currently publish a simple, current residential setback table. Because the zoning ordinance remains the controlling document, the parcel’s zoning requirements should be confirmed with Planning & Zoning before the modular home’s foundation is laid out.
Does Camas County, Idaho Allow Modular Homes?
Yes, Camas County requires a building permit for every dwelling regardless of size, and residential modular construction must satisfy the county zoning standards applicable to the property’s zoning district.
The R-1 Low Density Residential district requires at least one acre per dwelling. A residence is generally limited to 35 feet in height and requires a front setback of 60 feet measured from the road centerline, a 30-foot rear setback, a 20-foot interior-side setback, and a 20-foot street-side setback measured from the property line. Maximum lot coverage is 30 percent.
R-4 permits up to four dwellings per acre and uses significantly smaller yards: generally 20 feet front, 20 feet rear, 10 feet interior side, and 20 feet along a street side. Agricultural-transition zoning generally requires one acre with a 60-foot centerline front setback, 30-foot rear setback, and 20-foot side setbacks.
For exact requirements for your property, you can connect directly with your local planning department or the county departments if you reside in unicorporated areas.
Does Canyon County, Idaho Allow Modular Homes?
Yes. Canyon County allows and regulates modular residential construction through the same zoning framework used for other single-family dwellings, with the parcel’s zoning determining both minimum lot size and the required building envelope.
The county’s R-R, R-1, and R-2 residential zones all use standard setbacks of 20 feet in the front, 10 feet on the sides, 20 feet in the rear, and 20 feet on the street side of a corner parcel. Agricultural zoning generally requires 30 feet front, 10 feet side, 20 feet rear, and 30 feet on a corner.
Minimum lot sizes differ substantially. R-R has an average minimum residential lot size of two acres, R-1 one acre, and R-2 one-half acre. Within an Area of City Impact where central sewer and/or water service is available, certain R-1 and R-2 lots can be reduced to 12,000 square feet. Agricultural zoning generally requires 40 acres unless a qualifying administrative land-division provision applies.
Road classification can create a much larger effective setback. Structures generally must remain at least 50 feet from the centerline of a major collector, 120 feet from U.S. 20/26, 95 feet from SH-44, 90 feet from SH-55, and 70 feet from other principal arterials unless the applicable highway district approves a waiver. A separate 70-foot setback also applies to preserved section and quarter-section lines.
A private road must receive approval before a building permit can be issued for an inhabited structure using that road to reach a public street. Canyon County also requires at least 60 feet of public-road frontage for normal parcel access, subject to limited reductions and private-road alternatives
Does Caribou County, Idaho Allow Modular Homes?
Yes, Caribou County permits and allows single-family dwellings within its residential zoning system, and a modular residence must meet the lot-size and setback standards assigned to the applicable district.
In the High Density Residential district, single- and two-family residences generally require 30 feet from a local-road right-of-way and 50 feet from an arterial or collector right-of-way. Side setbacks are 10 feet, the rear setback is 20 feet, and maximum structure height is 35 feet.
Lot size is closely tied to wastewater infrastructure. The minimum is generally five acres when using a standard septic system, 2.5 acres with an approved nitrate-reducing septic system, and one-half acre when connected to both community water and a central sewer system.
Caribou County also requires structures to remain at least 100 feet from streams and riparian areas, except for qualifying infrastructure such as approved culverts. This environmental setback can be more restrictive than the ordinary rear or side yard on waterfront or stream-adjacent parcels.
Certain subdivisions have additional rules. Caribou Blue Landing and Blackfoot Harbor, for example, use their own 25-foot setback from surveyed road rights-of-way. The exact zoning and subdivision requirements should therefore be confirmed before establishing the modular-home footprint.
Does Cassia County, Idaho Allow Modular Homes?
Yes, Cassia County permits residential construction under its zoning and building codes, and a modular residence must meet the same basic site-development standards as other dwelling units in unincorporated areas.
The county states that the minimum lot area for a dwelling unit in unincorporated Cassia County is generally one acre, although section 9-4-2 of the county code contains exceptions.
For parcels not governed by different subdivision setbacks, the county’s common standard is 54 feet from the centerline of the adjoining street for the front and street-side yards. Interior side and rear setbacks are generally 15 feet. Accessory buildings must generally remain at least 10 feet from other structures.
Cassia County requires a building permit before construction begins and maintains separate permit processes for floodplain development and manufactured/mobile-home placement. The county’s distinction between a normal building permit and a manufactured-home placement permit is also useful when documenting a true Idaho modular home.
Does Clark County, Idaho Allow Modular Homes?
Yes, Clark County allows and regulates residential development through a joint county/city development code administered through its Planning and Zoning system. A modular residence therefore needs to comply with the permitted residential use applicable to the parcel rather than relying solely on its state modular approval.
The county’s development code establishes a joint Planning and Zoning Commission serving Clark County and the cities of Dubois and Spencer. The Planning and Zoning Administrator reviews applications for permitted activities and processes zone changes, lot splits, variances, conditional uses, subdivisions, planned developments, and floodplain permits.
The county also administers floodplain regulations, and its adopted hazard-planning documents confirm that building permitting and inspections are in place.
Does Clearwater County, Idaho Allow Modular Homes?
Yes! Clearwater County’s current Land Use Ordinance expressly permits single- and two-family dwellings in each of its R-1, R-2, and R-3 residential districts, making a modular home’s local placement legal.
R-1 and R-2 generally require a minimum 10,000-square-foot lot, at least 75 feet of lot width, and 75 feet of depth. Both use a 20-foot front setback. Side yards must generally provide at least 5 feet on one side and 10 feet on the other, while a side adjoining a road on a corner lot requires 20 feet. Rear setbacks are generally at least 5 feet, with 15 feet required in situations identified by the table. R-1 has a maximum height of 35 feet, while R-2 allows up to 45 feet.
R-3 Rural Residential requires at least one acre with 150 feet of width and depth. The front setback is 20 feet, the side-yard arrangement follows the same 5/10-foot minimum with 20 feet on a street side, and the rear requirement can increase to 20 feet. Maximum building height is 45 feet.
Agricultural zones are substantially larger. F-1 requires five acres, F-2 one acre, and F-3 generally 20 acres. If the residence faces the road, the front setback is 50 feet from the road centerline; if it does not face the road, the standard is 30 feet from the front property line. The rear setback is generally 20 feet.
For next steps, homeowners can begin with the local planning and zoning departments.
Does Custer County, Idaho Allow Modular Homes?
Yes, Custer County regulates residential development under Zoning Ordinance 2007-09, which remains the county’s core zoning ordinance and has been amended over time, including amendments adopted in 2026. A modular residence should therefore be evaluated as a dwelling under the applicable zoning district and current amended ordinance.
The county maintains Agricultural, Transitional Agricultural, Residential, Commercial, and other zoning classifications, and the controlling ordinance should be checked in its current amended form before a site is laid out. The county specifically publishes “Ordinance No. 2007-09 with Amendments as of August 2026” as its current zoning document.
Residential building height is generally limited to 35 feet in the county’s Agriculture, Commercial, and Industrial zones under an amendment to the zoning ordinance.
Floodplain development is governed separately under the county’s Flood Damage Ordinance, while subdivision and access requirements are administered through additional county ordinances and permits.
Does Elmore County, Idaho Allow Modular Homes?
Yes, Elmore County permits single-family modular residential development through its agricultural, recreational, rural-residential/mixed-use, and other zoning districts, and a modular residence must comply with the lot and setback controls in the county’s Zoning and Development Ordinance.
Under the currently adopted dimensional standards, Agriculture generally requires a 40-acre minimum lot with a 20-foot front setback, 20-foot rear setback, 10-foot side setback, and 20-foot street-side setback. Residential structures are generally limited to 35 feet in height.
The county allows smaller agricultural parcels in certain situations involving Farm Development Rights, cluster subdivisions, or applicable overlays.
The Rural Residential/Mixed Use district generally requires five acres. Under the adopted standards, residential development generally uses a 20-foot front setback, 20-foot rear setback, 10-foot side setback, and 20-foot street-side setback, with a maximum residential height of 35 feet.
Elmore County’s 2026 zoning update materials show that the county is actively revising portions of these standards. Because the amendments were still moving through the public-review process in 2026, the currently effective ordinance should be checked when permitting a specific parcel. The Land Use and Building Department administers these requirements in unincorporated Elmore County.
Does Franklin County, Idaho Allow Modular Homes?
Yes, Franklin County allows a modular residence through the same development and zoning standards that apply to a single-family dwelling, so the parcel’s zoning district determines the minimum lot area, required yards, and road-related setbacks.
The current dimensional table establishes a 50-foot front setback, 10-foot rear setback, 10-foot side setbacks, and a 50-foot corner setback in the Agricultural Residential, Rural Residential, R-1, and R-2 districts. Agricultural Residential generally requires 10 acres, Rural Residential and R-1 generally require one acre, and R-2 requires 2.5 acres. Maximum building height in these districts is 40 feet.
Franklin County Planning & Zoning should therefore be consulted to verify both the current zoning and road classification before establishing the foundation location. The county’s zoning jurisdiction excludes incorporated Clifton, Dayton, Franklin, Preston, and Weston, which maintain separate municipal regulations.
Does Fremont County, Idaho Allow Modular Homes?
Yes, Fremont County allows modular construction and requires residential development, including a modular residence, to comply with its Development Code before construction proceeds. Local zoning rules are up to the municipalities, so we can not provide exact setback and zoning regulations here.
However, a particularly important local step is the county’s “Permission Letter to Build,” which Planning lists among its current Class I approvals. This is a good place to start for next steps.
Does Gem County, Idaho Allow Modular Homes?
Yes, Gem County allows single-family residential development in its residential zones, so a modular residence must comply with the minimum lot size and dimensional requirements applicable to the parcel’s zoning classification.
The R-2 Residential Transitional district is intended for single-family homes served by individual wells and septic systems and generally requires at least one acre. R-3 Rural Residential similarly permits single-family development but requires a two-acre minimum lot.
Gem County also maintains agricultural zones and several other residential or mixed-use classifications, so lot size alone does not establish the final building footprint. The zoning ordinance contains separate yard regulations and additional standards that can affect structures near roadways, neighboring land uses, and other site features.
For a modular home using a private well and septic system, septic suitability is particularly important because those utility conditions are incorporated directly into the purpose and minimum-lot provisions of the R-2 and R-3 districts
Does Gooding County, Idaho Allow Modular Homes?
Yes, Modular homes are allowed and are regulated the same as site-built homes in Gooding County, making it simple for interested homeowners.
The county’s dimensional table is unusually straightforward. In the R-1 district, the minimum lot area is one acre with at least 100 feet of frontage. R-2 permits smaller lots of at least 10,000 square feet with 75 feet of frontage. Both districts generally require structures to remain 50 feet from a public right-of-way and at least 5 feet from other property lines. Maximum building height is 40 feet.
Gooding County also requires a 35-foot setback from the high-water mark of a natural waterway in both R-1 and R-2. The same waterway setback applies in the county’s agricultural and transitional districts.
Agricultural and Transitional zoning generally require at least one acre, a 50-foot right-of-way setback, and 5-foot property-line setbacks. These figures make Gooding County relatively simple to evaluate compared with counties that vary every setback by individual residential district.
Planning & Zoning administers the land-use ordinance and maintains the current zoning map, which was amended as recently as 2025. The parcel’s zoning should therefore be confirmed before relying on these standards
Does Idaho County, Idaho Allow Modular Homes?
Yes, Idaho County allows modular construction, but some nuances need clarification.
Idaho County, is unusual because its current countywide zoning ordinance classifies the unincorporated county as “multi-use” and generally imposes no conventional use restrictions except those created by other applicable county ordinances. A modular residence therefore does not face the same traditional residential zoning-district system found in many Idaho counties.
That does not mean residential development is completely unregulated. Idaho County’s subdivision regulations establish standards for lots created through subdivision and require compliance with applicable health, access, and development requirements. Rectangular subdivision lots generally must have at least 75 feet of frontage on a publicly dedicated street.
Where individual wells and subsurface sewage disposal are proposed, subdivision design must provide adequate spacing and location for those systems in accordance with applicable public-health standards. Land subject to flooding or otherwise considered uninhabitable cannot be platted for residential development in a way that would create or increase a hazard.
To confirm exact requirements, we recommend you reach out to the Idaho County Planning and Zoning Department.
Does Jefferson County, Idaho Allow Modular Homes?
Yes, Jefferson County allows and regulates residential construction under Chapter 112 of its zoning code, so a modular residence must comply with the zoning district, parcel-development standards, and building requirements applicable to the proposed dwelling site. The county’s codified zoning regulations are current through recent amendments.
Jefferson County also contains agricultural and residential districts as well as Areas of City Impact, making a single countywide front/side/rear setback potentially misleading. The exact dimensions should be taken from the current zoning classification assigned to the parcel rather than assumed from nearby development.
The county’s zoning policy also expressly encourages urban-type development to occur within incorporated cities and Areas of City Impact while protecting agricultural land elsewhere. That distinction is important when evaluating minimum parcel size and residential development potential on rural property.
Does Jerome County, Idaho Allow Modular Homes?
Yes, Jerome County allows and regulates modular-home placement through its zoning and building-permit process, and the county recommends obtaining zoning confirmation before beginning development to ensure residential use is permitted on the particular parcel.
The county maintains agricultural, residential, commercial, industrial, recreational, and Area of City Impact zoning through its current zoning ordinance and map. Because dimensional standards vary by zone and some Areas of City Impact have separate requirements, the parcel’s exact classification should be identified first.
Within the Jerome Area of City Impact, for example, the IMP-RES residential district requires a 25-foot front setback, 20-foot rear setback, 10-foot side setbacks, and a 15-foot street-side setback. The IMP-AL district uses 25 feet front, 20 feet rear, 12 feet side, and 25 feet on a street side.
Airport influence areas are another important local consideration. The county maintains separate Jerome and Hazelton Airport land-use and airspace maps, and some airport zones limit or prohibit residential density.
To confirm exact requirements, homeowners can connect with their local zoning departments.
Does Kootenai County, Idaho Allow Modular Homes?
Yes, Kootenai County allows modular residences and residential development subject to the Land Use and Development Code, so the zoning district controls the permitted use and dimensional requirements while state modular approval governs the factory-built portion of the structure.
The Rural zone is one of the county’s most common settings for detached homes. Structures in that district generally require a 25-foot front setback, 10-foot side setbacks, a 15-foot rear setback, and a 15-foot setback along a flanking street.
Those numbers should not be applied to every Kootenai County parcel. The county also has Agricultural Suburban, Rural Residential, restricted residential, commercial, industrial, and other zoning classifications, as well as Areas of City Impact and site-specific approvals. A recent county variance proceeding, for example, confirms a 25-foot front-yard requirement in the Agricultural Suburban zone.
Site disturbance is also separately regulated. Planning permits can be required for grading, excavation, storm drainage, and runoff-control work, particularly within subdivisions. Septic systems are reviewed by Panhandle Health District rather than simply through county zoning approval.
Kootenai County has also continued to amend its Land Use and Development Code, including recent proceedings involving residential setbacks, so the current zoning and any newly adopted amendments should be confirmed before relying on a dimensional standard.
Does Latah County, Idaho Allow Modular Homes?
Yes. Latah County expressly permits single-family dwellings within its residential zoning system, and a modular residence must meet the parcel-size and setback standards of the applicable zone before a building permit can be issued. The county code is current through Ordinance 419, adopted February 17, 2026.
In one of the county’s lower-density residential zones, the minimum eligible parcel size is one acre. Principal structures generally must remain 35 feet from a property line that does not abut a public right-of-way and at least 20 feet from the boundary of a public right-of-way or 60 feet from the road centerline, whichever produces the greater setback.
The Suburban Residential zone permits one single-family dwelling per eligible parcel and can permit additional residential density depending on acreage and whether public water and sewer are available.
Other higher-density residential zoning can have much smaller yards. For example, one county residential district requires a minimum 12,000-square-foot eligible parcel and generally uses 10-foot setbacks from property lines and public rights-of-way.
Latah County Planning and Building administers both the land-use ordinance and building-code process, so zoning approval and a building permit should be obtained before modular-home installation.
Does Lemhi County, Idaho Allow Modular Homes?
Yes, Lemhi County’s Development Code applies a common set of setback standards across most county zoning areas, making modular-home site planning more straightforward than in counties where every residential zone has its own yard table.
For most areas, a principal structure generally must be at least 25 feet from a front property line or arterial-road right-of-way. A corner-lot street side requires 15 feet. Side and rear setbacks are 10 feet for the first 10 feet of wall height and then increase on a one-to-one basis as the wall becomes taller.
Minimum lot size depends heavily on utilities and groundwater conditions. The basic minimum for many development areas is one acre, decreasing to one-half acre where central water or sewer is available and one-quarter acre where both are provided. Groundwater-vulnerability areas generally require 2.5 acres, with reductions available where central utilities are provided. Newly created lots generally need at least 110 feet of frontage.
These standards come from Lemhi County Development Code Ordinance 2023-1. Special standards apply to existing lots in areas such as Elk Bend and Gilmore, so those locations should be checked separately rather than applying the general county setbacks automatically.
Does Lewis County, Idaho Allow Modular Homes?
Yes, Lewis County regulates modular-home placement through its Planning and Zoning process, so an Idaho-approved modular residence must still comply with the local land-use rules and any subdivision standards that apply to the parcel.
Lewis County uses county zoning throughout its unincorporated areas, and that zoning also applies within at least some municipal Areas of City Impact. For example, Craigmont’s Area of City Impact specifically adopts the Lewis County comprehensive plan and zoning ordinance.
Properties inside incorporated communities such as Nezperce, Kamiah, Craigmont, and Winchester may also fall under municipal or Area of City Impact regulations rather than ordinary county standards.
For this reason, it’s vital that homeowners connect with their local planning and zoning departments for the most accurate information.
Does Lincoln County, Idaho Allow Modular Homes?
Yes. In Lincoln County, modular homes are held to the same standards as site-built homes.
The county’s current building-permit instructions establish very clear baseline setbacks: a new residential structure must generally remain at least 10 feet from all property lines and 75 feet from the centerline of a road. The site plan submitted for permitting must show these distances as well as the well, septic system, and other structures.
A septic or wastewater-system permit must be in place before a building permit can be issued for a new home. Lincoln County also requires applicable fire-department and highway-district review, and highway districts can impose additional approach or right-of-way requirements.
The county lists a 24-inch frost depth, 40-psf roof snow load, 57-psf ground snow load, seismic classification D, and 115-mph wind criterion in its current residential permit materials, all of which are relevant when engineering the on-site foundation for a modular home.
To learn more, interested homeowners can reach out to the Lincoln County Planning Department.
Does Madison County, Idaho Allow Modular Homes?
Yes, Madison County treats residential development through its Unified Development Code, so a modular home must meet the same underlying zoning, density, setback, utility, and site-development requirements that govern the permitted single-family dwelling use.
The county continues to use mapped zoning districts to determine permitted uses and associated development standards, and Madison County adopted an updated Comprehensive Plan and Land Use Map in 2024. Current 2026 Planning and Zoning proceedings continue to apply the county Unified Development Code when reviewing development and zoning changes.
Residential requirements therefore depend on the parcel’s district rather than on the fact that the house is modular. Madison County includes agricultural, transitional agricultural, and residential zoning, along with Areas of City Impact around communities such as Rexburg and Sugar City.
Does Minidoka County, Idaho Allow Modular Homes?
Yes. In fact. Minidoka County provides a particularly clear dimensional table for residential construction, so an Idaho modular residence can be sited using the same setback and lot standards that apply to other dwellings in the parcel’s zoning district.
In the Residential Low, Residential Medium, and Residential High zones, the standard setbacks are 20 feet in the front, 5 feet in the rear, 5 feet on an interior side, and 20 feet along a side street. Maximum height is generally 35 feet in Residential Low and Medium and 45 feet in Residential High.
The listed minimum lot area is generally one acre. When more than one dwelling is placed on the same parcel, the minimum lot area applies per dwelling unit. Similar one-acre minimums appear in the county’s agricultural zones, although Agricultural Low can be reduced to one-half acre where central water or sewer is provided.
Within an approved rural subdivision, front and street-side setbacks can generally be reduced to 20 feet from the street right-of-way. Certain platted subdivisions can qualify for a 10-foot street-side setback. Setbacks are measured from the property line, except where the property line lies in the roadway, in which case measurement begins at the road right-of-way.
Interested homeowners can reach out to the Minidoka County Planning and Zoning Department for more information.
Does Nez Perce County, Idaho Allow Modular Homes?
Yes, Nez Perce County permits residential modular development through several zoning classifications, including R-1 Single Family, Rural Residential, Agricultural/Residential 5-Acre, Agriculture 20-Acre, and other rural districts, so modular-home siting depends on the property’s exact zoning and whether it lies within the Lewiston Area of City Impact.
Within portions of the county development code, setbacks from roads are generally established as the greater of 20 feet from the property line or 45 feet from the road centerline, while other property-line setbacks can be as little as 5 feet. Building height in those provisions is limited to 35 feet and maximum building coverage to 40 percent.
Those figures should not be applied automatically across every Nez Perce County zone. The county has different standards for its R-1, Rural Residential, agricultural, farm, and Area of City Impact classifications, and accessory structures are expressly required to follow the setbacks of the underlying zoning district.
Does Oneida County, Idaho Allow Modular Homes?
Yes. Oneida County regulates modular residential projects through its Development Code and building-permit process, so state approval of the modular structure does not eliminate the need to comply with county zoning, setbacks, foundation requirements, and site-development rules.
Planning and Zoning maintains the county Development Code, zoning maps, Comprehensive Plan, land-use applications, and public-hearing process. Interested homeowners can connect with them for updated regulations and information.
Structural design is also significant in Oneida County. The Building Inspector publishes roof snow-load requirements that increase with elevation, from a minimum 40-psf roof live snow load to 100 psf or more at sites above 6,800 feet. Modular-home foundation and roof documentation therefore needs to account for the actual site elevation.
Does Owyhee County, Idaho Allow Modular Homes?
Yes, Owyhee County permits residential construction within its rural and agricultural zoning framework, with a modular dwelling required to satisfy the same basic siting rules that apply to another residence on the property.
One of the county’s core zoning setback provisions states that no building or structure may be placed within 5 feet of a property line, 40 feet of a county road, or 100 feet of a state or federal highway.
These road setbacks are particularly important in Owyhee County because much of the county is rural and many residential properties front county, state, or federal routes rather than conventional subdivision streets.
To learn more about septic processes, permits, and setbacks, we suggest you reach out directly to the Owyhee County Planning and Zoning Department.
Does Payette County, Idaho Allow Modular Homes?
Yes, Payette County regulates modular-home placement through its zoning and siting-permit process, with the county requiring compliance with local setbacks even though the factory-built structure itself is approved under Idaho’s modular-building program.
The county’s agricultural siting materials summarize the normal setback rule as 15 feet from property lines, increasing to 30 feet where the property adjoins a public or private road or road right-of-way. The measurement is taken from the property line or road right-of-way, whichever produces the greater setback.
Waterfront property has a much larger restriction. No building or structure may generally be placed within 75 feet of the high-water mark of the Payette River or Snake River. The county also states that structures on property adjoining certain public lands must remain 200 feet from the public-land boundary.
For sites using onsite sewage disposal, Payette County requires the proposed structure to be located so that the existing septic system and drain field will not be compromised, with Southwest District Health approval potentially required.
The county’s Planning and Zoning Department administers these requirements, so they are the best place to start for more information.
Does Power County, Idaho Allow Modular Homes?
Yes, Power County specifically permits single-family dwellings, including modular construction, in its Rural Residential zoning districts, making those district standards directly relevant to a modular residence proposed on rural property. The county Development Code is current through amendments adopted in 2026.
In the RR-3 Rural Residential district, minimum lot size depends on site conditions. Land with slopes over 15 percent generally requires five acres; groundwater-vulnerability areas and land with slopes between 8 and 15 percent require three acres; and other land generally requires at least one acre unless it is within an approved subdivision.
A residence in RR-3 generally requires a 50-foot setback from property lines along arterial roads, 35 feet along other roads, and 10 feet from side and rear property lines. Maximum building height is 35 feet unless a greater height receives special-use approval.
You can connect with the Power County Zoning Department for more information.
Does Shoshone County, Idaho Allow Modular Homes?
Yes, shoshone County regulates a modular residence according to the zoning district in which the property is located, and the county publishes a Building Setbacks Chart as part of its current Planning and Zoning resources.
In the R-1 Residential district, a principal structure generally requires a 25-foot front setback, 20-foot rear setback, 5-foot interior-side setback, and 20-foot street-side setback. The minimum lot area is 7,700 square feet, with approximately 70 feet of frontage and 110 feet of lot depth. Maximum building height is 35 feet.
The Single-Family Residential R-O district uses the same 25-foot front, 20-foot rear, 5-foot side, and 20-foot street-side setbacks. Suburban Residential also uses those setback figures but generally requires two acres.
For exact setbacks and permit processes, you can head to the local planning department and ask the staff what you’ll need for your property.
Does Teton County, Idaho Allow Modular Homes?
Yes, Teton County permits residential development through several rural and residential zoning classifications, with modular homes governed by the same dimensional rules for other dwellings in the district.
The RN-5 Rural Neighborhood district has an average density of one dwelling per five acres but allows individual lots as small as one acre, with a minimum 100-foot lot width. The minimum front and side setbacks are 30 feet, the rear setback is 40 feet, and normal residential building height is limited to 30 feet.
The FH-10 Foothills, FH-20 Foothills Priority Protection, RR-20 Rural Residential, RA-35 Rural Agriculture, and LA-35 Lowland Agriculture districts use the same basic one-acre minimum individual lot size, 100-foot minimum width, 30-foot front/side setbacks, 40-foot rear setback, and 30-foot residential height limitation, although their permitted overall densities vary dramatically.
For example, RR-20 has an average density of one dwelling per 20 acres, while RA-35 and LA-35 generally use one dwelling per 35 acres. That distinction between minimum individual lot size and overall development density is important when evaluating whether a parcel can actually be divided for another modular home.
For exact requirements for your property, we suggest you reach out to the Teton County Zoning Department.
Does Twin Falls County, Idaho Allow Modular Homes?
Yes, Twin Falls County regulates modular residential development under its county zoning code and building-permit system, so the dwelling must comply with both the permitted residential use and the setbacks applicable to the parcel.
Much of unincorporated Twin Falls County remains agricultural. In the Agricultural Zone, the county generally permits one single-family dwelling for each 40 acres or more of contiguous land held under a single ownership, subject to the other provisions of the zoning code.
Residential subdivisions are permitted through a conditional-use process in the Rural Residential zone, but are not permitted in the Agricultural Range Preservation, Agricultural, Airport Overlay, Commercial, or Industrial zones.
Front-yard setbacks also interact with highway-district requirements. The county code specifically states that buildings must comply with the applicable highway district’s setbacks for designated major and minor collectors.
We recommend that you visit the Twin Falls Planning and Zoning Department to verify exact requirements.
Does Valley County, Idaho Allow Modular Homes?
Yes, Valley County provides very clear baseline residential setbacks, making it relatively straightforward to determine the requirements for a modular home residence.
The current county residential standards require 20 feet from the front property line, 20 feet from the rear, 7.5 feet from interior sides, and 20 feet along a side street. Maximum building coverage is generally 35 percent and maximum residential building height is 35 feet.
Setbacks are measured from the eaves rather than the exterior wall. The county also requires at least 6 feet between buildings. A residential structure generally must remain 50 feet from a high-water line, and all buildings must remain 100 feet from the Highway 55 right-of-way.
For new subdivisions, the minimum lot size generally depends on utilities. A one acre with individual well and septic needs to be 20,000 square feet with central water and individual sewage disposal, 12,000 square feet if there is central sewer and an individual well, and 8,000 square feet where both central systems are provided.
To find out more information, you can contact the Valley County Planning and Zoning Department.
Does Washington County, Idaho Allow Modular Homes?
Yes, Washington County regulates and allows modular residential construction through its county zoning and building codes.
In the A1 and A2 agricultural zones, a dwelling or other structure generally must remain at least 15 feet from property boundaries and 15 feet from a street right-of-way. A much larger 100-foot setback applies from state or federal highways.
The A2 Agricultural Transitional zone is particularly relevant to rural residential development. It permits residential subdivisions with lots of one acre or larger while retaining the agricultural-zone setback framework.
One unusual Washington County issue is residential building eligibility. The Planning and Zoning Department states that anyone seeking to determine whether a parcel has an available residential dwelling building permit or property split must submit research establishing the chain of ownership of the original parcel as of April 9, 1979. The county then determines available building permits or splits.
Washington County has also adopted state building codes with local design criteria including ground snow loads ranging from approximately 30 to 140 psf depending on location and a frost depth of approximately 24 to 30 inches. These conditions should be incorporated into the modular home’s local foundation and structural design.
To move ahead, you can connect with your local zoning and planning departments.
Looking for a Modular Home Builder Serving Idaho?
Knowing Idaho’s modular home regulations is important.
Finding a builder who understands how to work within those regulations is just as important.
At Zook Cabins, we’ve been helping customers turn their dream homes into reality since 2006. Our certified modular homes are built in a climate-controlled facility and designed to meet the building codes required for their final destination.
Whether you’re dreaming of a cozy log cabin tucked into the Idaho mountains or a modern home surrounded by wide-open views, we have options for you.
Explore all modular homes or learn more about how modular homes are built.
Or if you’re ready to take the next step, contact us or request a free quote. We’d love to hear from you!
Frequently Asked Questions about Modular Homes in Idaho:
What Kind of Foundation Does A Modular Home Need in Idaho?
A modular home needs a permanent foundation designed to meet applicable building codes and the specifications of the home.
For Zook Cabins modular homes, that generally means either a crawl space or a full basement.
This is one area where planning ahead matters. Your foundation needs to be ready before your modular home arrives so the modules can be placed and secured correctly.
Want to dig deeper? Read our complete guide to modular home foundation options.
Can Modular Homes Be Used As ADUs?
Yes, a modular home can potentially be used as an accessory dwelling unit (ADU) in Idaho, but approval depends heavily on where your property is located.
Idaho law provides certain protections for internal ADUs, but that does not create a statewide right to place a detached modular ADU on every residential property.
That means your first step should be checking with your local planning and zoning department. For additional information, check out our guide to Idaho ADU regulations.
If your property allows one, take a look at Zook Cabins’ ADU homes or read our guide comparing prefab and modular ADUs.
Does Idaho Require Land to Already Be Owned Before Buying a Modular Home?
Idaho does not have a general law requiring you to already own land before you begin shopping for or planning a modular home.
However, you will need an approved building site before the home can actually be installed.
And there’s a good reason we recommend finding your property early.
Your land affects nearly every part of your project, including zoning, setbacks, foundation design, septic approval, well placement, utilities, delivery access, and even which home designs will work.
Before purchasing raw land, talk with the county or city about whether your intended modular home is allowed on the property. This will save a lot of headache in the future.
What Utility Hookups Are Required for a Modular Home in Idaho?
A modular home needs the same basic utilities you would expect in a traditional residence.
That typically includes electricity, potable water, and an approved wastewater system. Depending on the property, you may also choose propane or natural gas.
A property within a developed area may connect to municipal water and sewer. A rural Idaho property may instead require a private well and septic system.
Planning a rural build? Our guides to well planning for modular homes and modular home septic systems are great places to start.
What Are Modular Homes and Are They Allowed in Idaho?
Yes, modular homes are allowed in Idaho.
Idaho law defines a modular building as a building or building component that is substantially or entirely prefabricated somewhere other than the final building site.
So what does that mean for you?
Instead of constructing the entire home piece by piece on your property, most of the modular home is completed inside our manufacturing facility. The finished modules are then transported to your Idaho property and assembled on the prepared foundation. Modular buildings installed in Idaho must also receive the required state approval and insignia.
Curious about the process? Learn more about modular home construction and what to expect after delivery.
What Is the Difference Between a Modular Home and a HUD Manufactured Home?
This is one of the most common sources of confusion in the prefab housing world.
A modular home and a manufactured home may both be built inside a manufacturing facility, but they are not the same thing.
Modular homes are constructed to the applicable state and locally adopted building codes for their destination and are installed on a permanent foundation. Modular homes are viewed very similarly to site-built homes.
Manufactured homes are constructed under the federal HUD Manufactured Home Construction and Safety Standards and are built on a permanent chassis. At Zook Cabins, they are known as luxury mobile homes.
We created an entire guide explaining modular homes vs. manufactured homes to help you understand the differences.
How Close Can a Modular Home Be to Property Lines?
There is no single Idaho setback that applies to every modular home in every county.
Instead, setback requirements are generally determined by your local zoning regulations.
Your zoning district may establish minimum front, side, and rear setbacks. Those are typically anywhere from 20-50 feet for front setbacks and 5-15 ft rear and side setbacks.
To verify exact setback requirements, we recommend you contact your local zoning department and ask about setbacks for your address.
Do You Need A Permit For A Modular Home in Idaho?
Yes. You should expect permits and approvals to be part of building a modular home in Idaho.
The factory-built portion of a modular home is regulated through Idaho’s modular-building program. Idaho requires modular buildings installed in the state to receive approval and bear the state’s insignia of approval.
Your project also requires local building or zoning approval, foundation permits, electrical or plumbing permits for site work, septic approval, and other permits depending on the property.
The exact list varies depending on where you build, so before beginning site work, contact the city or county with jurisdiction over your property and ask exactly which permits your property requires.
What Size Modular Homes Does Zook Cabins Have to Offer?
Maybe you’re looking for a small Idaho getaway where you can disappear for the weekend.
Or maybe you need enough room for the entire family.
Either way, there are plenty of options.
Zook Cabins currently offers modular designs ranging from compact homes like The A-Frame Retreat at 470 square feet to large family homes approaching 3,000 square feet, depending on the model and floor plan.
You can browse all Zook Cabins models to compare square footage, bedrooms, bathrooms, floor plans, and styles.
What Features are Included in a Modular Home from Zook Cabins?
One of the biggest advantages of modular construction is just how much of your home can be completed before it ever reaches Idaho.
When you purchase a modular home from Zook Cabins, your home will arrive with all major interior components such as flooring, cabinetry, plumbing fixtures, electrical systems, bathrooms, interior walls, windows, doors, and much more already installed.
On top of that, there are extra special features to truly make your home stand out like cathedral ceilings, fireplaces, covered porches, and so much more depending on the model.
Read our modular home delivery guide to see what happens when your home makes its journey from our facility to your property.
Does Zook Cabins Have Modular Homes with Multiple Bedrooms and Bathrooms?
Absolutely.
A modular home doesn’t have to mean a tiny home.
Zook Cabins offers everything from one-bedroom retreats to four-bedroom family homes, with many models offering multiple floor plans and bathroom configurations.
If you only need a cozy space for one or two people, models like The Wrangler and The Spruce keep things compact.
Need more room?
Homes like The Canyon Lodge and The Homestead can offer up to four bedrooms, while several other models provide two- and three-bedroom layouts.
One-Bedroom Modular Homes
| Model | Bathrooms |
| The Wrangler | 1 |
| The Spruce | 1 |
| The A-Frame Retreat | 1 |
| The Mountaineer | 1–2 |
| The Mountaineer Deluxe | 1–2 |
| The Musketeer | 1–2.5 |
| The Chalet | 1–2 |
| The Glacier | 1–2 |
| The Canyon Lodge | 2–2.5 |
| The Homestead | 1–3 |
Two-Bedroom Modular Homes
| Model | Bathrooms |
| The Lariat | 1 |
| The Juniper | 1 |
| The Timberline | 2 |
| The Mountaineer | 1–2 |
| The Mountaineer Deluxe | 1–2 |
| The Musketeer | 1–2.5 |
| The Chalet | 1–2 |
| The Glacier | 1–2 |
| The Alpine | 1–2 |
| The Frontier | 1–2 |
| The Pioneer | 1–2 |
| The Settler | 1–2 |
| The Sunset Ridge | 2 |
| The Two Pines | 2 |
| The Woodland | 1–2 |
| The A-Frame Lodge | 2–3 |
| The Canyon Lodge | 2–2.5 |
Three-Bedroom Modular
| Model | Bathrooms |
| The Alpine | 1-2 |
| The Chalet | 1-2 |
| The Frontier | 1-2 |
| The Glacier | 1-2 |
| The Homestead | 1-3 |
| The Mountaineer | 1-2 |
| The Mountaineer Deluxe | 1-2 |
| The Pioneer | 1-2.5 |
| The Settler | 1-2 |
| The Sunset Ridge | 1-2 |
| The Two Pines | 2 |
| The Woodland | 1-2 |
| The A-Frame Lodge | 2-3 |
| The Walden Stack | 3 |
Homes Four-Bedroom Modular Homes
| Model | Bathrooms |
| The Canyon Lodge | 2–2.5 |
| The Homestead | 1–3 |
Can A Modular Home from Zook Cabins be Customized?
Here at Zook Cabins, modular doesn’t mean “one-size-fits-all.”
Depending on the model, we provide options for you to choose from different floor plans, sizes, finishes, layouts and more to create a home that better fits your property and lifestyle.
Explore our modern modular homes or browse the complete Zook Cabins collection to start gathering ideas.
Do Modular Homes Have Good Resale in Idaho?
They certainly can.
The biggest misconception people often have is assuming a modular home automatically depreciates like a mobile home simply because part of it was constructed in a factory.
However, that’s not the case.
A certified modular home is constructed to residential building codes and installed on a permanent foundation. When it comes time to sell, factors such as location, market demand, and land value influence its value more than the fact it is modular.
Fannie Mae does not differentiate between modular homes and site-built homes, which is good support for modular home resale value.
We took a much deeper look at this question in our guide to modular home resale value.
Conclusion
Building a modular home in Idaho doesn’t have to feel like navigating a maze of permits and regulations.
Since 2006, Zook Cabins has helped customers across the country turn an idea into a home they can actually step inside and enjoy.
Maybe yours belongs somewhere in Idaho.
Browse our modular homes and find the one that feels like home. Then you can contact us to keep the process going or request a free quote on your favorite model.